Safety-valve.



No. 781,913. PATENTED FEB. 7, 1905. L. SGHUTTE.

SAFETY VALVE.

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/A Vidi/infill I, Il I. i y/j///-wmunv-W n No. 781,913. PATENTED FEB. 7, 1905. L. SGHUTTE.

SAFETY VALVE.

APPLIOATIOH Hun JULY '1. 1904.

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' YIINTTED STATES Patented February '7, 1905.

PATENT Ottica.,

LOUIS SOHUTTIG, OF PHILADELPHIA, PFNNSYLVANIA, ASSIGNOR TO SCI'IUITE AND KOERTING COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

SAFETY--VALVE SPECIFICATION forming part of Letters Patent No. 781,913, dated February 7', 1905l Application filed July 7, 1904. Serial No. 215.637.

Be it known that I, LoUrs SonUTTn, a citizen of the United States of America, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Safety- Valves, of which the following is a true and exact description, reference being had to the accompanying drawings, which Vform a part thereof.

My invention relates to safety-valves, and especially intended and adapted for use in connection with hydraulic mains and for the purpose of providing a valve which will yield under sudden increases of pressure, such as are incident to the ram-like action of the liquid on sudden stoppage; but my invention is .also adapted for use in connection with steam or other mains in which safety-valves are required or advisable.

rlhe nature of my improvements will be best understood as described in connection with the drawings, in which they are illustrated, and in which--v Figure I is a sectional elevation of a valve embodying my invention in what I consider to be its best and most practicable form. Fig. 2 is a similar elevation showingI a modilication of my improved valve. Fig. 3 is again a sectional elevation showing such a modification as is incident to the use et' the valve where the entrance and exhaust chambers of the casing are reversed from the positions they occupy in Figs. I and 2, and Fig. i is a sectional elevation showing an equivalent arrangement for that illustrated in Fig. l.

A, Fig. 1, indicates the easing of the valve, which is Yformed with entrance and exit chambers A and A(a and with the connecting` port or passage Af, provided at its top with a valveseat A. rPhe modified casings As of Fig. Q,

A of Fig. 3, and Am of Fig. I are provided with the same parts; but it will be understood that in Fig. 3 A`2 is the entrance-chamber and A' the exit-chamber.

Referring to the construction shown in Fig.

l I, A5 is an open-ended cylinder formed directly beneath the valve-seated passage A, and A is a threaded opening through the top of the casing, into which screws the cover-section B, which is formed with a downwardly-extending cylindrical portion B in direct line to the port Al of preferably slightly less diameter than the port Al and of considerably greater diameter than the cylinder AI. '.lhrough the top of the cylinder B is formed the port l?, which communicates through ports B and BL with the outlet-chamber of the casing, the port-section B72 being provided with a valveseat at its top, as shown. l'-l indicates a threaded. perforation in the top of the cover, in'to which screws the spring-casing O, the lower end being' utilized to form part of a stullinggland, as indicated at (Y, and the casing O, inclosing an adjustable spring (f, which through convenient connecting mechanism presses down against a valve l), which passes through the gland C' and is held by the spring on the valve-seat of the port Bi. E is the main valve, which, as shown in Fig. I, has a downwardlyextending portion ll, which connects it with a piston Il, moving in the cylinder A and through which is formed a transverse port E, connecting with the bottom of a vertical port E, arranged through the valve and its upper cylindrical extension E, which lits in the cylinder B, the port IC" being directly in line with the port Bf. F is a rod which is situated in a port E3, so as to form a loose-litting piston therein, the rod having preferably a diameter substantially equal to the exposed face of the valve l).

In operation the spring O'l is adjusted so as to hold the valve l) to its seat at a predetermined pressure, which is regulated, of course, by the pressure which the conduits are intended to be exposed to. lhe valve E being seated, the pressur'e of the tluid in the chamber A is communicated to the cylinder B' through the ports Elg and IC, and the valve is held to its seat by this pressure, the aggregate pressure acting on the pistons E" and E0 being materially greater than the pressure acting directly on the valve E. IVhen the pressure in the chamber A and cylinder B exceeds that determined by the spring-pressure on the valve D, this valve is raised from its seat and the liquid in the cylinder B escapes through ports B2, B3, and BA1 to the outletchamber A2, and the diminution of pressure on the piston E permits the valve E to open, as the exposed area of the valve is greater than that of the piston E2; but the release of pressure in cylinder B2 causes the full pressure of the chamber A to act on the pistonlike rod F, forcing it upward into the port E3 and into the port B2, its end coming in contact with the valve D and guiding that valve away from its seat until the pressure acting on the rod F falls below that exerted by the spring C2. My device thus avoids the chat tering, so to speak, of the valve D, which wouldvtake place if no such device were provided to prevent it, and it will of course be understood that as soon as the valve D seats itself on the port B2 the pressure of chamber A will promptly be restored to the cylinder B and the safety-valve closed.

In the construction shown in Fig. 2 the device is very similar except that in place of having the open-ended cylinder A5 the casing is formed with a guide perforation A2, into which an extension E of the projection E of the valve E extends. In this construction also it will be noticed that the cylinder marked B2, which takes the place of the cylinder B, is of proportionately larger area with respect to the port Ai than is the case in Fig. 1. Otherwise the devices are practically the same and need no further description.

In the construction shown in Fig. 3 the cover marked B7, which takes the place of the cover B of Figs. l and 2, is secured to the casing in a somewhat different manner, but otherwise -does not differ materially from the cover B. The cylinder B in the construction of Fig. 8 is somewhat larger than the similar cylinder in Fig. 2, and the transverse ports E2 in place of being formed in the valve extension E are formed above the valve proper, so as to communicate with the chamber A2, which in this construction is the inlet-chainber of the casing. The operation of the device is practically as already described and need not be further explained.

In Fig. 4 I have illustrated a modification in which in place of the cover B of Fig. l a cover H is provided, which is formed with a piston-like extension H, in which piston-like extension are formed the ports B2 and B2, the Valve D extending through the piston-like extension to seat itself on port B2. The main valve E in this modification in place of having a piston extending up from its top isY formed with a cylindrical extension, (marked G,)

which iits on the piston H, the device being in every respect an equivalent for the construction shown in Fig. l, with simply a reversal of the piston and cylinder construction, and in this connection I will note that where in my claims I refer to a piston as connected with the valve I intend to be understood as including also such a modified construction as Fig. 4.

In the constructions of Figs. l, 2, and 4 the packing devices illustrated are such as are adapted for use with hydraulic mains. In the construction of Fig. 3 I have indicated a structure which is more particularly adapted for use with steam-mains where the cupleather packing would not be necessary or desirable.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is4

l. A safety-valve having in combination a valve-casing having inlet and outlet chambers connected by a passage including a valve-seat, a cylinder situated above said valve-seat and connected to the outlet-chamber of the casing through a port, B2, B3, a valve D, normally closing said port and held to its seat by resilient pressure, a valve arranged to close the main port in the chamber, a piston attached thereto and moving in the cylinder aforesaid, said valve and piston having a port E2', formed therein in line with the port B2, and a lateral port or ports connecting said port E3, with the inlet-chamber of the casing, and a rod F, forming a loose-fitting piston in the port E, and adapted, when raised, to impinge on valve D. Y

2. A safety-valve having in combination a valve-casing having inlet and outlet chambers connected by a passage including a Valve-seat, a cylinder situated above said valve-seat and connected to the outlet-chamber of the casing through a port B2, B2, a valve D, normally closing said port and held to its seat by resilient pressure, a valve arranged to close the main port in the chamber, a piston attached thereto and moving in the cylinder aforesaid, said valve and piston having a port E3, formed therein in line with the port B2, and a lateral port or ports connecting said port E3, with the inlet-chamber of the casing and a rod F, having a sectional area substantially equal to the exposed face of valve D, said rod forming a loose fitting piston in the port E2, and adapted when raised to impinge on valve D.

3. A safety-valve having in combination a casingprovided with inlet and outlet chambers connected by a port including a valve-seat, said casing being formed or provided with a closed-ended cylinder B, situated above the valve-seat and an open cylinder A5, of less diameter situated below the valve-seat, in combination with a conduit B2 B2, leading ICO IIO

ing', and n rod. F, fornninlg a loose-fitting' piston in port E", and adapted to impinge on I0 valve D, when raised.

LOUIS SCHUTTE.

Witnesses:

CHAS. F. MYERS, D. STEWART. 

